JPS5944491B2 - Gas turbine engine Niokel Nenshiyouki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas turbine engine, and more particularly to a combustor for a gas turbine engine equipped with an air-fuel mixture injection valve that blows a portion of air compressed by a compressor into a combustion tube of the combustor together with fuel.

In gas turbine engines, NO contained in exhaust gas
In order to reduce That's what I do.

The air introduced into the mixture injection valve is normally compressed by a compressor and sent to the combustor combustion cylinder, and the air is branched and guided.
The fuel is atomized by this injection of high-pressure air.

However, the pressure difference between the pressurized air sent from the compressor and the internal pressure of the combustor combustion cylinder is very large, and is approximately 0.1~
Q: Since it is about 5Kq/cm", it is not possible to atomize the fuel sufficiently, and as a result, the mixture cannot be combusted efficiently and a large amount of HC and "0" are generated. There was fear.

The present invention has been made in order to eliminate such conventional drawbacks.The present invention has been made in order to eliminate such drawbacks of the conventional art. The pre-combustor heats the air introduced into the mixture injection valve to promote atomization of the fuel, thereby reducing NOx and HC by burning a lean mixture.

It is designed to significantly reduce the production of CO, and its embodiments will be described below with reference to the drawings.

In FIGS. 1 and 2, the air-fuel mixture supplied from the air-fuel mixture injection valve 1 is continuously combusted in the combustor m2, producing high-temperature, high-pressure combustion gas.

This high-temperature, high-pressure combustion gas exits the flow roller 4, reaches the compressor turbine 5, is expanded, rotates the compressor turbine 5, and drives the compressor 6.
It is introduced into the output turbine 7 of the next stage, rotates the output turbine 7, is taken out as an output by the output shaft 8, and is input to the load 9.

The compressor 6 pressurizes the introduced air to a predetermined pressure.

The air pressurized by the compressor 6 is transferred to the heat exchanger 1 through a passage 10.
1, rotates the output turbine 7 in the heat exchanger 11, and is heated by the heat of the exhaust gas discharged after expansion is almost completed, and the outer cylinder 2a and the inner cylinder 2b of the combustor combustion cylinder 2 are heated. The air is introduced into the air passage 3 formed in between, and is supplied into the inner fdZb from the swirler 2c provided at the upper part of the inner m2b and the air hole 2d provided in the inner cylinder peripheral wall.

On the other hand, a part of the air pressurized by the compressor 6 is passed through the passage 10.
The mixture enters a passage 12 formed by branching from the air mixture, and is introduced into the mixture injection valve 1.

The air entering the passage 12 may be pressurized by interposing a booster pump 13 in the passage 12 depending on the case.

In such a configuration, according to the present invention, a passage 1 for introducing a part of the air compressed by the compressor 6 into the mixture injection valve 1 is provided.
2 is provided with a pre-combustor 15.

The mixture injection valve 1 is formed, for example, in a venturi shape as shown in FIG. 2, and has a throat portion 1a formed with a fuel injection nozzle 1b. Fuel is injected into the air stream via a fuel passage 18.

The pre-combustor 15 includes a mixture injection valve 16 and a combustion cylinder 17, and the fuel supplied from the mixture injection valve 16 through a passage 19 branched from the fuel passage 18 and the passage 1.
A mixture with air supplied through a passage 14 branched from 2 is injected into the combustion tube 17 and combusted continuously, and this combustion gas flows around the pre-combustor 15 and heads toward the throat portion 1a. It actively heats the air.

In addition, 20°21 in the figure indicates the combustor combustion tube 2 and the pre-combustor 1.
The ignition plug provided at No. 5 is used to ignite the engine only when the engine is started, and the mixture is then injected into high-temperature combustion gas for continuous combustion.

Therefore, according to the combustor of the present invention having such a configuration, the air-fuel mixture is diluted by a large amount of air injected together with fuel from the air-fuel mixture injection valve 1, and the inherent NOx reduction effect due to the use of the air-fuel mixture injection valve is reduced. At the same time, the air introduced into the mixture injection valve 1 is actively heated by the pre-combustor 15, so the injected fuel is actively evaporated by this high-temperature air and atomized. As a result, a homogeneously distributed air-fuel mixture can be supplied to the combustion tube of the combustor, stabilizing combustion and significantly reducing the production of HC and CO.

As described above, according to the present invention, even if the pressure difference between the pressurized air that exits the compressor and is introduced into the mixture injection valve and the internal pressure of the combustor combustion cylinder is small, the pressurized air is not introduced into the mixture injection valve. Since the air is heated by the pre-combustor, it is possible to promote atomization of the fuel, thereby stabilizing the combustion of the air-fuel mixture and reducing HC-C.
The generation of O can be significantly reduced, and the combustion of a lean mixture can reduce the amount of N produced.
Combined with the Ox reduction effect, this has the practical effect of effectively implementing comprehensive exhaust countermeasures.

[Brief explanation of drawings]

FIG. 1 is a schematic system diagram of a gas turbine engine equipped with a combustor according to the present invention, and FIG. 2 is a schematic cross-sectional explanatory diagram of the combustor of the present invention. 1...Mixture injection valve, 2...Combustor combustion tube, 5...Compressor turbine, 6...
... Compressor, 7... Output turbine, 8...
...Output shaft, 9...Load, 10...
・Passage for supplying pressurized air to the combustion tube of the combustor, 11...
... Heat exchanger, 12 ... Passage for supplying pressurized air to the mixture injection valve, 15 ... Pre-combustor, 16
...Pre-combustor mixture injection valve, 17...
- Combustion tube of pre-combustor.

Claims (1)

[Claims] 1. In a gas turbine engine in which the air at the outlet of the compressor is branched from the air passage that sends it to the combustion cylinder of the combustor and is guided to the mixture injection valve of the combustor, the compressed air after branching is arranged upstream of the mixture injection valve. A combustor installed in a gas turbine engine that is equipped with a pre-combustor for heating.